Environmental
Polychlorinated biphenyls (PCBs) are hazardous substances found in older commercial buildings that may be present in:
AWindow glass of pre-1940 buildings
BElectrical transformers and capacitors, and some older caulking materials✓ Correct
CConcrete foundations
DRoof shingles
Explanation
PCBs were used in electrical transformers, capacitors, and some building materials (caulks, sealants) in older buildings. They are toxic and regulated under TSCA. Their presence in Oklahoma commercial buildings requires proper handling and disclosure.
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